C# 从SQL表中提取单个行值

我有一个sql表，需要从中提取某些数据。例如：

这是我的sql表的一个例子，我需要为我的应用程序提取星期一的红色，以获得一个实时互动程序。如此类推，我可能需要抽周二的红色或黄色

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是否有一个查询可以帮助我实现这一点

如果我没有弄错的话，这是一个基本的查询，可以满足您的需求。我假设表头是列名

获取周一的红色：

select [monday] from table where [key] = 'Reds'

select [tuesday] from table where [key] = 'Reds'

select Monday from SUMMARY where Key LIKE 'Reds' //Can also match wildcards, Slower

select Tuesday from SUMMARY where Key = 'Reds'  //Preferred , Faster 

获取周二的红色：

select [monday] from table where [key] = 'Reds'

select [tuesday] from table where [key] = 'Reds'

select Monday from SUMMARY where Key LIKE 'Reds' //Can also match wildcards, Slower

select Tuesday from SUMMARY where Key = 'Reds'  //Preferred , Faster 

对于周一的红色：

select [monday] from table where [key] = 'Reds'

select [tuesday] from table where [key] = 'Reds'

select Monday from SUMMARY where Key LIKE 'Reds' //Can also match wildcards, Slower

select Tuesday from SUMMARY where Key = 'Reds'  //Preferred , Faster 

对于周二的红军：

select [monday] from table where [key] = 'Reds'

select [tuesday] from table where [key] = 'Reds'

select Monday from SUMMARY where Key LIKE 'Reds' //Can also match wildcards, Slower

select Tuesday from SUMMARY where Key = 'Reds'  //Preferred , Faster 

*根据您的评论，假设SUMMARY是您的表名。
两种方法都有效
请参见此处的LIKE和=之间的区别：
请在此处尝试：

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我正在寻找sql代码谢谢您的回复。我尝试了这个查询，但发现了错误。我从摘要中写入SELECT[Monday]，其中[Key]=“Reds”，并得到一个错误，表示表名附近有错误。不确定我做错了什么。您使用的是哪种DBMS？Microsoft SQL Server？这很有效。非常感谢。